The voltage gain of an amplifier is 150. If the output voltage doubles for the same amount of input voltage), the voltage gain equals
A)49.5 db.
B)43.5 db.
C)21.7 db.
D)114 db.

Question

Quizplus · Accepted Answer

The voltage gain in decibels (dB) is calculated using the formula: Gain(dB) = 20 * log10(Vout/Vin). If the output voltage doubles, the gain in dB increases by 6 dB. The original gain is 20 * log10(150) ≈ 43.5 dB. Doubling the output voltage adds 6 dB, resulting in a total gain of 49.5 dB.

The Voltage Gain of an Amplifier Is 150